Carburetor



Oct. 10, 1933. E. J. ERIKSSON 1,930,423

CARBUREJTOR Filed Dec. 21, 1932 Z. EMA 55m IN we N 711K Patented Oct. 10, 1933 UNITED STATES PATENT OFFICE lndins 9 Claims. (CL 28151) This invention relates to an improved carburetor with float chamber and sprayer, in which a continuous supply of fuel at different revolutions of a motor is obtained by means of a siphon adaptedtoberaisedandloweredandusedas a connecting pipe between the float chamber and the sprayer. The siphon and the throttle valve are connected with each other in such a manner that the nozzle is located above the level'of fuel when the motor is not running alternatively during dead run with closed throttle, and that the diflerence of level relatively to the nozzle and the sprayer always contributes to the correct mixing of the fuel and the air in different positions of the throttle from dead run to the highest speed.

The advantage of this device is that the fuel gets a hydrostatic pressure, which automatically accompanies every increase-or decrease of the air quantity, which cannot be obtained-in other carburetors, in which the rarefaction of the air is to direct the fuel to a pluralityof lowand high-speed noml in which cases the supply of fuel becomes irregular or'gradual between each nozzle. 25 In other carburetors with a continuous supply of fuel by means of conical pins or cock plugs the quantityv of fuel is increased at continued wear and tear of the said parts and must be adjusted repeatedly; in the-siphon principle this drawback is removed.

A further advantage of a siphon, which is adapted to be raised or lowered, is that without additional canals and levers it may-be formed as an acceleration pump.

An embodiment of the invention is shown in the accom nying drawing in Figure 1, which is a vertical section of a carburetor according to the invention, whereas Figure'2 is a partial vertical section of a modifled embodiment.

1 indicates the float chamber with its float 2. 3 indicates the venturi to the cylinder (not shown) and 4 is the air inlet. 5 indicates the throttle valve.

The connecting pipe between the float chamber and the sprayer consists of a siphon 6 adapted to be raised and lowered, which by one of its legs 25, said leg dipping into the float chamber or fuel bath, extends through guides 7, 8 of the float chamber and with its other leg 26, the said leg extending in the venturi and the air conduit respectively, is guided'in a slot 9 made in the wall of the inlet pipe for the air. The siphon is secured to a rod 10, nectedwithalinkflat ILsaidIinkbeinginits which is pivotally con-.

turn rigidly connected with the throttle valve 5. The spraying nozzle secured to the siphon leg 26 is indicated by 13. The connection between the siphon and the throttle is of such a kind that the nozzle 13 extends above the level of fuel when the motor is not running or during dead run of same.

On starting the motor the throttle valve is opened as usual by means of the lever, which results in a lowering of the siphon 6, by which the self-pressure of the fuel increases and the fuel is thrown into the cylinder. According to the varying position of the siphon relatively to the level of fuel in the float chamber a continuous supply of fuel regulated in accordance with the speed of the motor is thus obtained.

In order to obtain, when starting the motor, a still higher pressure on the fuel and thus an increased supply of fuel the siphon may be formed 7 as an acceleration pump in accordance with 5 Figure 2. The figure shows only the leg 25 of the siphon along with adjacent parts of the float chamber. The arrangements for the rest are as those described above. Yet, in such a case the leg 25 of the siphon extending down into the float chamber is formed with very thick walls, so that a relatively narrow supply pipe or e 14 is obtained for the fuel. Thus the said leg is formed as a piston and is slidable in a canal 15 formed in the float chamber, said canal being provided with an inlet opening 16 for the fuel. A special valve box 17 is screwed into the lower part of the canal 15and provided with an opening 23, which communicates with the opening 16, and further provided with a constriction on its sur face the said constriction 24 being on the same level with the said opening, a valve 18 being arranged in said box, which valve, by the action of a spring 19, is displaceable along a rod 20 extending in a recess 22 of the valve box and secured in same, for the purpose of shutting and releasing respectively the outlet opening from the recess 22. The rod 20 is provided with a body 21 limiting the upper end position of the loo valve. The tension of the spring is accommodated in such a manner that the valve is normally held in its open position shown in Figure 2.

When starting the siphon is lowered in the above described manner, the leg or piston 25 in the canal 15 being pressed down for instance into the position shown in dashed lines; the valve 18 being closed (also shown in dashed lines) and the whole quantity of fuel in the canal 15 no being pressed upward in the direction indicated bythearrowandbeingatonetimesprayedinto the cylinder. The stronger this down ofthepiston25iseffectedthequickerthefuel will be thrown in.

It is obvious that the embodiment shown only has been chosen as an example and that modifications may be made without coming outside the scope of the invention. Thus for example other arrangements for connecting the siphon with the throttle valve may be thought of.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

l. A carburetor comprisinga body having a chamber and a float chamber therein,

mixing a siphon having one leg thereof immersed in the fuel in the float chamber and the other leg thereof arranged in said mixing chamber, a

fuel nozzle communicating with the last mentioned leg of said siphon, a throttle valve in said body, said siphon being mounted for movement relatively to said body, and actuating means connecting the throttle valve with said siphon and positioning the latter, when the throttle valve is in closed and idling position, to dispose the nomle above the level of the fuel in the float chamber 'and acting as the opening movement of the throttle valve progresses,- to lower the nozzle with respect to the level of the fuel in said float, chamber. i

2. A carburetor as claimed in claim 1 characterized in that the siphon and nomle are moved. during the opening movement of the throttle valve, in the direction of the flow of fluid through said mixing chamber.

3. A carburetor as claimed in claim 1, characterized by the provision of an air inlet at the upper end and a mixture outlet at the lower end of said body, said nozzle being moved during the opening movement of the. throttle valve, downwardly, with respect to the air inlet.

4. A carburetor as claimed in claim 1 characterizedbythepr'ovision of-meansguidingthe first mentioned leg of said siphon, said body being provided with a slot receiving and guiding said siphon.

5. Acarburetorasclaimedinclaim lcharacterized by the'provisionof means guiding the first mentioned leg of said siphon. said body bein provided with a slot receiving and guiding said siphon, said actuating means includinga link connection between the throttle valve and said siphon.

6. A carburetor as claimed in claim 1 characterized by the provision of ineanscoacting with the siphon to produce a piston action whereby during movement of the siphon in one direction, fuel is injected into the siphon.

7. A carburetor as claimed in. claim 1 characterized by the provision of means coacting with the siphon to produce a piston action whereby during movement of the siphon in one direction, fuel is injected into the siphon, said piston like means including a pressure controlled valve interposed between the siphon and the float chamber.

8. A carburetor as claimed in claim 1 characterized by the provision of means coacting with the siphon to produce a piston action whereby during movement of the siphon in one direction, fuel is injected into the siphon, and a pressure controlled check valve interposed between the siphon and the float chamber operating to prevent the back flow of fuel from the siphon to the float chamber.

9. A carburetor as claimed in claim 1 characterized by the provision of a cylinder-like part receiving the first mentioned leg of the siphon 119 whereby the latter operates in the manner of a piston during its movement, and a valve device connecting the cylinder-like part with the float chamber, said valve device-including a movable valve member, and spring means coacting therewith, and guide means for said valve member limiting the movement thereof.

ERIK JOHAN ERIKSSON.

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